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Pre-requisites

• OpenJDK8
• Zookeeper

Install OpenJDK

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$ vim /home/zookeeper/zookeeper-3.4.13/conf/zoo.cfg

dataDir=/var/lib/zookeeper
server.1=node1:2888:3888
server.2=node2:2888:3888
server.3=node3:2888:3888

Now, do the below changes in log4.properties file as follows.

$ vim /home/zookeeper/zookeeper-3.4.13/conf/log4j.properties

zookeeper.log.dir=/var/log/zookeeper 

zookeeper.tracelog.dir=/var/log/zookeeper 

log4j.rootLogger=INFO, CONSOLE, ROLLINGFILE

...

In Zookeeper ensemble out of three servers, one will be in leader mode and other two will be in follower mode. You can check the status by running the following commands.

$ /home/zookeeper/zookeeper-3.4.13/bin/zkServer.sh status

Zookeeper Service Status Check.

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$ echo stat | nc node1 2181

Lists brief details for the server and connected clients.

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$ echo mntr | nc node1 2181

Zookeeper list of variables for cluster health monitoring.

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$ echo srvr | nc localhost 2181

Lists full details for the Zookeeper server.

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If you need to check and see the znode, you can connect by using the below command on any of the zookeeper node:

$ /home/zookeeper/zookeeper-3.4.13/bin/zkCli.sh -server `hostname -f`:2181

Connect to Zookeeper data node and lists the contents.

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